The Sea to Summit Ascent Down Sleeping Bag (-1°C) is a highly versatile three-season bag built for backpacking comfort across a wide range of conditions. With 750+ fill power Ultra-Dry goose down, a relaxed mummy shape, and the adaptable Free-Flow Zip system, it delivers warmth, ventilation, and flexibility in one lightweight package. Ideal for backcountry users who want technical performance without compromising on comfort.

Features

• Versatile three-season sleeping bag designed for backpacking use

• RDS-certified 750+ fill power goose down insulation with non-PFC Ultra-Dry Down treatment

• Free-Flow Zip system allows multiple ventilation and sleeping configurations

• Can be opened flat and used as a quilt in warmer conditions

• Relaxed mummy fit offers more space than a traditional performance mummy bag

• Technical hood can be cinched down for added warmth in colder weather

• Draft-tube protected zippers help reduce heat loss

• Box baffle construction improves warmth distribution throughout the bag

• Vertical torso baffles help minimise down migration and maintain insulation performance

• Lightweight 20D recycled nylon shell with non-PFC DWR finish resists wind and moisture

• Soft 20D recycled nylon liner improves next-to-skin comfort

• Hood is shaped to accommodate an Aeros pillow

• Shoulder zip coupling compatible with selected Sea to Summit Women’s sleeping bags

• Footbox zipper and shoulder snap configuration allows wearable use around camp

• Supplied with a 40D recycled bluesign APPROVED nylon compression bag